Cap and shell fastening for lamp-socket casings



W. ILE

July 12, 1927.

CAP AND SHELL FASTENING FOR LAMP SOCKET CASINGS Filed July 2, 1925 when desired.

Patented July 12, 1927.

UNITED, STATES WILLIAM ILE, or JACKSON, MICHIGAN, Assicnon TO REYNOLDS SPRING COMPANY,

v 1, 35,323 PATENT OFFICE.

OF JACKSON, MICHIGAN, A CORPORATION OF DELAWARE.

CAP AND SHELL FASTENING Application filed July 2,

The invention relates to a cap and shell fastening for lamp socket casings.

The object of the present invention is to provide a simple, practical and efiicient cap and shell fastening of strong, durable and comparatively inexpensive in construction capable of enabling a cap to be easily and quickly applied to a shell and of securely fastening the cap thereon,and of also permitting the ready removal of the cap A further object of the invention. .is to provide a cap" and shell fastening of this character inwhich the coact-ing' fastening means on the shell will not impair the strength and durability of the same and thereby afford a lamp socket casing of this character having a shell of maximum strength and durability.

With these and other objects in view, the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawing and pointed out in the claim hereto appended, it being understood that various changes in the form, proportion and minor details of construction, wthin the scope of the claim, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing:

Figure 1 is a perspective view of a lamp socket casing constructed in accordance with this invention, the cap being shown separated from and elevated above the shell or body portion of the casing.

Fig. 2 is a vertical sectional view of the same the cap being shown separated from the body portion or shell and properly positioned with relation thereto for interlocking the cap with the shell.

Fig. 3 is a similar view the cap and shell being interlocked.

Fig. 4t is a horizontal sectional view of the same.

In the accompanying drawing in which is illustrated the preferred embodiment of the invention 1 designates the metallic shell or body portion of the lamp socket casing provided at its upper end which is tele scopically engaged by the flange 2 of the cap 3 with equally spaced grooves of substantially uniform width located at diametrically opposite points and arranged to slidably receive interiorly arranged projections 4 of the FOR LAMP-SOCKET casinos;

1925. Serial No. 41,208.

cap 3. Three of the grooves designated by the numeral5 are approximately L-shaped or bayonet shaped and consist of vertical en-' trance branches 6 and horizontal branches 7 while the fourth groove 8 is vertical. The cap is adapted to be telescopically fitted over the upper end of the shell and the projections 4 are formed by indenting the metal of the flange 2 from the exterior to provide interior projections or protuberances inte.-. gral with the cap. These interior projec tions or protuberances are adapted .to fit and slidein the vertical branches 6 of the? L-v shaped. grooves 5. and in the. vertical groove 8 by a telescopic movement of the cap with relation to the shell. After the cap has been moved telescopically over the shell to the inner ends of the vertical branches 6 of the grooves 5 and the inner end of the groove 8, the cap is partially rotated to the left to carry the projections 4 into engagement with perforations 9 and 10. The perforations 9 and 10 are equally spaced and are of a size to receive the projections 4. The perforations 9 are located adjacent to the outer ends of the horizontal branches 7 of the grooves 5 while the perforations 10 are located adjacent the vertical groove 8. The perforations 9 and 10 are equally spaced from the vertical branches 6 and the vertical groove 8 so that the projection will be carried by relative rotary movement of the parts into engagement with the perforations 9 and 10. Any one of the perforations may be fitted in any one of the grooves so that. it is not necessary to arrange the cap in any ill) particular position with relation to any particular groove, it being only necessary to position the projections so that they will enter the grooves. The perforation which engages the groove 10 moves over an imperforate portion of the shell which is not indented or depressed at the perforation 10 so that the projection and perforation 10 will form a lock for holding the parts against relative rotary movement, it being necessary to depress or compress the shell at the perforation 10 to disengage the same from the projection of the cap when it is desired to remove the latter. To facilitate the easy compression of the shell the latter is provided adjacent the vertical groove 8 with a slit or kerf 11. The outer ends of the branches 7 of the grooves 5 indent or depress the metal of the jections fitting in the perforations 9 may be readily moved out of the same and Will; slide in and out of the perforations by a relative eta y mov me t f he p r s t u e,- sistance when the loeking device formedby the perforation" 10 in one of the projections does not interfere. with. such relative rotary movement; The projections Will engage the metal of the shell at thetopsof the. penfo rations 9 as Well as at all points except Where the metal. is depressed; "at. the horizontal: branchesot the grooves 5 and when the cap, is fitted on a shell; in interlocked; relation shell: beingalso' provided; with perforations spaced equally from the vertical entrance n es. and. he vert a gr qvesflm perferations offthe li shaped grooves being arranged at the extremity ofthe horizontal branches and forming, extensions thereof, and providing openings at the terminals of the horizontal branches, and a cap provided With interior projections slidable in h g EQQY y ele eenie movement o the cap over the. shell; and; adapted; to, be cart e n o. he perf ra i ns by r la re rot ry movementof the capand shell, said projecion ei ga. ameter equa to h W dth of the grooves and: to the, diameter; oh the ope gs. n h p jectiongag ng.- the. perfor ti adjac t; the er cal groove. forming a; positive, lock, for holding. tlieica-p and shell against, relative rotary, movement; In testimony whereof I have. herenntoset my hand; v v

WILLIAM LE. 

